WCF – Manage DataContract Members Order/Sequence

I was calling my WCF services from JQuery. Basically I was calling $getJSON to retrieve JSON data to display it in a dynamic table.

I started facing problem with the data sequence. It looked like i was not getting data at the same sequence it is in the class. My class looked like that[DataContract]
public class MyClass
{
public DateTime Interval { get; set; }
public Double Actual { get; set; }
public String Units { get; set; }